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  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
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    <script>
      function add(a, b, c, d) {
        return a + b + c + d;
      }

      function curry(fn, ...rest) {
        return function (...args) {
          const newArg = [...rest, ...args];
          if (fn.length <= newArg.length) {
            return fn.apply(this, newArg);
          }

          return curry(fn, ...newArg);
        };
      }

      const newAdd = curry(add, 1);
      console.log(newAdd(2, 3)(4));
      console.log(newAdd(2)(3)(4));
    </script>
  </body>
</html>
